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I'd just do it in the spring. Once a year or 4-5000 miles for me. A little less if I track the car alot. With a decent filter and 13 qts - tough to get really dirty.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey
Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2
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